docs: refresh social preview copy and layout

- Tagline now leads with the two surfaces ("Context Tab and /context
  command.") and keeps the made-of / evolves framing.
- Title all white; six-category legend fits one line; wider left column;
  right app shot enlarged in place; dropped the 中文/EN chip.
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bowenliang123 committed 2026-08-16 23:33:43 +08:00
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